If you look at the way Ronnie got into bodybuilding it's not hard to think he is some genetic freak. Unlike many bodybuilders, he had a good job, reason to live, and seemed half way smart. College educated even...
Also, why lie about not taking steroids? Most liars simply pull the old lines like The Rock or something and totally bullshit the answer. Even Arnold, a politician, lied about using drugs earlier in his career but not later. That sounds better to the "masses", but saying you used to be natural, and then started using drugs, is self-incriminating.